The Corps is keeping the Bullfrog for a while longer, the last time I talked to the recruiter about OCS, he said the last CH-46 pilot probably wasn't even born yet. The Corps is keeping the hiey too.
Assuming the V-22 works out well, both choppers will be kept well behind the lines.
The F-35, could be some bad mojo, not enough firepower, if you have to unload most of it's stores for STOl, and the rear visibility sucks.